7i76 spindle out wiring

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17 Oct 2019 18:57 #148141 by Ross77
Im trying to connect up a mesa 7i76 to the sprit 400 DC spindle driver in my Denford nova Mill but unsure on how best to wire it.

The 7i76 manual says to wire it up with the 3 wires ( +10, 0 and centre) to act as a pot replacement but the existing wiring on the Denford only uses two wires (0v and centre) is the sprint configured different for a Denford or does the denford controller generate the 10v internally?

Thought it was going to a simple retrofit but its turning into a major rewire. :)

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17 Oct 2019 19:14 #148144 by tommylight
Replied by tommylight on topic 7i76 spindle out wiring
Can not see the schematics, so take this with a grain of salt:
If there is no 10V output on the drive, you will have to provide one and wire the output of the power supply to the +10V and GND on the 7i76 and the GND and viper on Mesa to the 0V and viper on the drive. Also i've read several times that a 12V adapter will do just fine at any current rating. The heavy ones with a big transformer are not recommended as they do output 16V with no load.
You should wait a bit till PCW can reply as he is the ultimate expert on this.

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17 Oct 2019 21:25 #148151 by Ross77
Replied by Ross77 on topic 7i76 spindle out wiring
The sprint 400 does have a 10v output so guess I'll connect it up then. Just wanted to check in case the Denford one worked differently.

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18 Oct 2019 23:18 #148233 by Ross77
Replied by Ross77 on topic 7i76 spindle out wiring
So I tried wiring it up tonight and its not working as it should.

Wired as per mesa docs with 3 wires for pot replacement.

With no load there is 10v on the Sprint400, but when its connected to the Mesa card it drops to 2.7v. I can get the spindle spinning but it runs when it should be stopped and then just gets faster as I start the spindle from LCNC.

Any ideas? I note that the Sprint 400 is a non isolated board but the isolated output from the mesa should be ok.

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18 Oct 2019 23:20 #148235 by Ross77
Replied by Ross77 on topic 7i76 spindle out wiring
This is the denford wiring diagram

This browser does not support PDFs. Please download the PDF to view it: Download PDF

Attachments:

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18 Oct 2019 23:34 #148240 by tommylight
Replied by tommylight on topic 7i76 spindle out wiring
Hal and ini files ?
And do double check the wiring, that does not seem right, it should work properly as per the above wiring explanation.

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18 Oct 2019 23:42 - 18 Oct 2019 23:44 #148243 by bevins
Replied by bevins on topic 7i76 spindle out wiring
When the spindle is not suppose to be running, you need to remove the run signal. Close it when you get an M3,

Without the run signal, it should not spin.

motion.spindle-forward ===> output (run contact on VFD)
Last edit: 18 Oct 2019 23:44 by bevins.

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18 Oct 2019 23:57 #148250 by Ross77
Replied by Ross77 on topic 7i76 spindle out wiring

Hal and ini files ?
And do double check the wiring, that does not seem right, it should work properly as per the above wiring explanation.


The machine is at the workshop so will have to check tomorrow. thanks

When the spindle is not suppose to be running, you need to remove the run signal. Close it when you get an M3,

Without the run signal, it should not spin.

motion.spindle-forward ===> output (run contact on VFD)


I did think that but I'm sure I should be able to have the spindle running slowly. at the moment it seems to be a minimum of 1000rpm

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19 Oct 2019 00:32 #148253 by bevins
Replied by bevins on topic 7i76 spindle out wiring
Are the two commons attached?

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19 Oct 2019 02:06 #148261 by PCW
Replied by PCW on topic 7i76 spindle out wiring
You may need to supply an isolated 10 or 12V since it looks like the spindle control
cannot supply the ~5 mA that the 7I76 analog out circuitry needs.

Note the _isolated_ make sure the supply is isolated (no PC supplies etc)

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